Inspired by this online video (in french) https://www.youtube.com/watch?v=Kg3_gLO-reE this design is a cubic flexahedron.
Thanks to schuetzi99 s link design this model is easy to mount.
STL files available here (v1) correspond to a 6.5 cm edge cube.
Print 12 Element_v1 and 24 Link_v1
Mount elements and links as shown on fifth photo then close the loop.